She said she only went along with the ‘torture’ because Kieren Batten, 43, said she was boring.

Prosecutor Simon Wilshire told the jury that the controlling and dominant Batten was ‘obsessed with ‘sadomasochistic sexual practices’.

He claimed Batten introduced a home-made electrical shocking device into their sex life and the woman initially consented to it being attached to her nipples because she did not know what the pain would be like.

Cambridge Crown Court heard how the the kinky sex began (Picture: David Gruar/Wikicommons)

However, the prosecutor said that once it had been used she told him it was a step too far and she never wanted to do it again.

But it is alleged that Batten attached the device to the woman’s labia and turned it on despite being told not to.

In a video-taped police interview, the woman explained how their kinky sex began.

She said: ‘It started with dressing gown cords and my arms tied to the end of the bed, like Fifty Shades of Grey but then it got further and further and I felt really uncomfortable but I just took it because he said I was boring.

‘I have never done that with anyone. He didn’t do it out of nastiness but it would progress. He would bring like camping rope, proper thick rope.

The 27-year-old said she was often whipped ‘black and blue’ (Picture: Fifty Shades of Grey/Focus Features)

‘Then he brought the board and told me what it was for. I thought he was having a laugh but no, he was pretty serious.

‘The first few times he put me on it, it was not horrible at all. I felt brave enough to go on it. Like whipping, to give pleasure, not pain.’